Journal ArticlePhysical Review C · July 1, 2024
The amount of light produced by nuclear recoils in scintillating targets is strongly quenched compared to that produced by electrons. A precise understanding of the quenching factor is particularly interesting for weakly interacting massive particles (WIMP ...
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Journal ArticlePhysical Review D · May 1, 2024
We consider the potential for a 10 kg undoped cryogenic CsI detector operating at the Spallation Neutron Source to measure coherent elastic neutrino-nucleus scattering and its sensitivity to discover new physics beyond the standard model (BSM). Through a c ...
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Journal ArticlePhysical review letters · December 2023
Using an 185-kg NaI[Tl] array, COHERENT has measured the inclusive electron-neutrino charged-current cross section on ^{127}I with pion decay-at-rest neutrinos produced by the Spallation Neutron Source at Oak Ridge National Laboratory. Iodine is one the he ...
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Journal ArticlePhysical Review C · October 1, 2023
Liquid argon detectors are employed in a wide variety of nuclear and particle physics experiments. The addition of small quantities of xenon to argon modifies its scintillation, ionization, and electroluminescence properties and can improve its performance ...
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Journal ArticleChinese Physics C · October 1, 2023
A new search for two-neutrino double-beta (2νββ) decay of 136Xe to the excited state of 136Ba is performed with the full EXO-200 dataset. A deep learning-based convolutional neural network is used to discriminate signal from background events. Signal detec ...
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Journal ArticlePhysical Review D · October 1, 2023
Using neutrinos produced at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL), the COHERENT collaboration has studied the Pb(νe,Xn) process with a lead neutrino-induced-neutron (NIN) detector. Data from this detector are fit joint ...
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Journal ArticleAnnual Review of Nuclear and Particle Science · September 25, 2023
Detection of low-energy nuclear recoil events plays a central role in searches for particle dark matter interactions with atomic matter and studies of coherent neutrino scatters. Precise nuclear recoil calibration data allow the responses of these dark mat ...
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Journal ArticleAnnual Review of Nuclear and Particle Science · September 25, 2023
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory provides an intense, high-quality source of neutrinos from pion decay at rest. This source was recently used for the first measurements of coherent elastic neutrino-nucleus scattering (CE ...
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Journal ArticleJournal of Instrumentation · June 1, 2023
Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way of generating large simulated datasets at a reduced computational cost. In this work, a novel approach to perform the simulation of photodetector s ...
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Journal ArticlePhysical review letters · February 2023
The COHERENT Collaboration searched for scalar dark matter particles produced at the Spallation Neutron Source with masses between 1 and 220 MeV/c^{2} using a CsI[Na] scintillation detector sensitive to nuclear recoils above 9 keV_{nr}. No evidence for d ...
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Journal ArticlePhysical Review D · January 1, 2023
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using the EXO-200 detector. We report an average electron-recoil background rate of 6.8×104 cts kg-1 yr-1 keV above 4 MeV and find no statistica ...
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Journal ArticleJournal of Instrumentation · October 1, 2022
We present results of several measurements of CsI[Na] scintillation response to 3-60 keV energy nuclear recoils performed by the COHERENT collaboration using tagged neutron elastic scattering experiments and an endpoint technique. Earlier results, used to ...
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Journal ArticlePhysical Review D · September 1, 2022
We use data from the COHERENT CsI[Na] scintillation detector to constrain sub-GeV leptophobic dark matter models. This detector was built to observe low-energy nuclear recoils from coherent elastic neutrino-nucleus scattering. These capabilities enable sea ...
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Journal ArticlePhysical Review D · August 1, 2022
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a pulsed source of neutrons and, as a by-product of this operation, an intense source of pulsed neutrinos via stopped-pion decay. The COHERENT collaboration uses this source to investi ...
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Journal ArticlePhysical review letters · August 2022
We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in a high flux of neutrinos produced at the Spallation Neutron Source at Oak Ridge National Laboratory. New data collected before de ...
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Journal ArticlePhysical Review D · March 1, 2022
The NEWS-G collaboration uses spherical proportional counters (SPCs) to search for weakly interacting massive particles (WIMPs). In this paper, we report the first measurements of the nuclear quenching factor in neon gas at 2 bar using an SPC deployed in a ...
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Journal ArticleJournal of Instrumentation · March 1, 2022
We present the analysis and results of the first dataset collected with the MARS neutron detector deployed at the Oak Ridge National Laboratory Spallation Neutron Source (SNS) for the purpose of monitoring and characterizing the beam-related neutron (BRN) ...
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ConferenceJournal of Physics: Conference Series · February 21, 2022
Testing the DAMA/LIBRA annual modulation result independently of dark matter particle and halo models has been a challenge for twenty years. Using the same target material, NaI(Tl), is required and presently two experiments, ANAIS-112 and COSINE-100, are r ...
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Journal ArticleJournal of Instrumentation · February 1, 2022
The EXO-200 experiment searched for neutrinoless double-beta decay of 136Xe with a single-phase liquid xenon detector. It used an active mass of 110 kg of 80.6%-enriched liquid xenon in an ultra-low background time projection chamber with ionization and sc ...
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Journal ArticleJINST · December 5, 2021
We present the analysis and results of the first dataset collected with the
MARS neutron detector deployed at the Oak Ridge National Laboratory Spallation
Neutron Source (SNS) for the purpose of monitoring and characterizing the
beam-related neutron (BRN) ...
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Journal Article · November 3, 2021
We present results of several measurements of CsI[Na] scintillation response
to 3-60 keV energy nuclear recoils performed by the COHERENT collaboration
using tagged neutron elastic scattering experiments and an endpoint technique.
Earlier results, used to ...
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Journal Article · October 21, 2021
The COHERENT collaboration searched for scalar dark matter particles produced
at the Spallation Neutron Source with masses between 1 and 220~MeV/c$^2$ using
a CsI[Na] scintillation detector sensitive to nuclear recoils above
9~keV$_\text{nr}$. No evidence ...
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Journal Article · October 14, 2021
We measured the cross section of coherent elastic neutrino-nucleus scattering
(\cevns{}) using a CsI[Na] scintillating crystal in a high flux of neutrinos
produced at the Spallation Neutron Source (SNS) at Oak Ridge National
Laboratory. New data collected ...
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Journal Article · September 22, 2021
The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory is a
pulsed source of neutrons and, as a byproduct of this operation, an intense
source of pulsed neutrinos via stopped-pion decay. The COHERENT collaboration
uses this source to investig ...
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Journal ArticlePhysical Review D: Particles, Fields, Gravitation and Cosmology · September 3, 2021
A search for Majoron-emitting modes of the neutrinoless double-beta decay of
$^{136}$Xe is performed with the full EXO-200 dataset. This dataset consists of
a total $^{136}$Xe exposure of 234.1 kg$\cdot$yr, and includes data with
detector upgrades that hav ...
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Journal ArticlePhys. Rev. D. · September 2, 2021
The NEWS-G collaboration uses Spherical Proportional Counters (SPCs) to
search for weakly interacting massive particles (WIMPs). In this paper, we
report the first measurements of the nuclear quenching factor in neon gas at
\SI{2}{bar} using an SPC deploye ...
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Journal ArticleJournal of Instrumentation · August 1, 2021
We report on the technical design and expected performance of a 592 kg heavy-water-Cherenkov detector to measure the absolute neutrino flux from the pion-decay-at-rest neutrino source at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory ...
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Journal Article · July 23, 2021
We propose the construction of LEGEND-1000, the ton-scale Large Enriched
Germanium Experiment for Neutrinoless $\beta \beta$ Decay. This international
experiment is designed to answer one of the highest priority questions in
fundamental physics. It consist ...
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Journal Article · July 13, 2021
The EXO-200 experiment searched for neutrinoless double-beta decay of
$^{136}$Xe with a single-phase liquid xenon detector. It used an active mass of
110 kg of 80.6%-enriched liquid xenon in an ultra-low background time
projection chamber with ionization a ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · June 1, 2021
nEXO is a proposed tonne-scale neutrinoless double beta decay (0νββ) experiment using liquid 136Xe (LXe) in a Time Projection Chamber (TPC) to read out ionization and scintillation signals. Between the field cage and the LXe vessel, a layer of LXe (“skin” ...
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Journal ArticleIEEE Transactions on Nuclear Science · December 1, 2020
Characterization of the vacuum ultraviolet (VUV) reflectance of silicon photomultipliers (SiPMs) is important for large-scale SiPM-based photodetector systems. We report the angular dependence of the specular reflectance in vacuum of SiPMs manufactured by ...
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Journal Article · November 22, 2020
The non-linear energy response of the plastic scintillator EJ-260 is measured
with the MicroCHANDLER detector, using neutron beams of energy 5 to 27 MeV at
the Triangle Universities Nuclear Laboratory. The first and second order Birks'
constants are extrac ...
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Journal Article · October 21, 2020
We report on the preparation of and calibration measurements with a
$^{83\mathrm{m}}$Kr source for the CENNS-10 liquid argon detector.
$^{83\mathrm{m}}$Kr atoms generated in the decay of a $^{83}$Rb source were
introduced into the detector via injection in ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · October 11, 2020
The scintillation anisotropy of the single-crystal organic scintillator trans-stilbene was characterized for recoil protons between 0.56 and 10 MeV. The light output and pulse shape anisotropies were measured at 11 distinct recoil proton energies for over ...
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Journal Article · August 28, 2020
Now that conventional weakly interacting massive particle (WIMP) dark matter
searches are approaching the neutrino floor, there has been a resurgence of
interest in detectors with sensitivity to nuclear recoil directions. A
large-scale directional detector ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · August 21, 2020
Measurements of electron drift properties in liquid and gaseous xenon are reported. The electrons are generated by the photoelectric effect in a semi-transparent gold photocathode driven in transmission mode with a pulsed ultraviolet laser. The charges dri ...
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Journal Article · June 22, 2020
Release of COHERENT collaboration data from the first detection of coherent
elastic neutrino-nucleus scattering (CEvNS) on argon. This release corresponds
with the results of "Analysis A" published in Akimov et al., arXiv:2003.10630
[nucl-ex]. Data is shar ...
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Journal ArticlePhysical Review C · June 1, 2020
Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure the absolute scintillation and ionization yields generated by γ interactions from Th228 (2615 keV), Ra226 (1 ...
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Journal ArticlePhysical review letters · June 2020
We report on a comparison between the theoretically predicted and experimentally measured spectra of the first-forbidden nonunique β-decay transition ^{137}Xe(7/2^{-})→^{137}Cs(7/2^{+}). The experimental data were acquired by the EXO-200 experiment during ...
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Journal Article · March 25, 2020
We report the first detection of coherent elastic neutrino-nucleus scattering
(CEvNS) on argon using the CENNS-10 liquid argon detector at the Oak Ridge
National Laboratory Spallation Neutron Source. Two independent analyses prefer
CEvNS over the backgroun ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · February 11, 2020
The light output function of the fast plastic scintillator EJ-228 was measured using a coincident neutron scatter measurement system and quasi-monoenergetic neutron beams produced by the tandem Van de Graaff accelerator at Triangle Universities Nuclear Lab ...
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Journal ArticleJournal of Instrumentation · January 17, 2020
Understanding reflective properties of materials and photodetection efficiency (PDE) of photodetectors is important for optimizing energy resolution and sensitivity of the next generation neutrinoless double beta decay, direct detection dark matter, and ne ...
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Journal ArticlePhysical review letters · December 2019
Dual-phase xenon detectors lead the search for keV-scale nuclear recoil signals expected from the scattering of weakly interacting massive particle (WIMP) dark matter, and can potentially be used to study the coherent nuclear scattering of MeV-scale neutri ...
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Journal ArticlePhysical review letters · October 2019
A search for neutrinoless double-β decay (0νββ) in ^{136}Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between 0νββ and background events. Relative to previous analyses, the signal detection efficiency has been r ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · October 1, 2019
In this paper we report on the characterization of the Hamamatsu VUV4 (S/N: S13370-6152) Vacuum Ultra-Violet (VUV) sensitive Multi-Pixel Photon Counters (MPPC)s as part of the development of a solution for the detection of liquid xenon scintillation light ...
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Journal ArticleJournal of Instrumentation · September 24, 2019
nEXO is a proposed experiment to search for the neutrino-less double beta decay (0νββ) of 136Xe in a tonne-scale liquid xenon time projection chamber (TPC) . The nEXO TPC will be equipped with charge collection tiles to form the anode. In this work, the ch ...
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Journal Article · August 1, 2019
Dual-phase xenon TPC detectors are a highly scalable and widely used
technology to search for low-energy nuclear recoil signals from WIMP dark
matter or coherent nuclear scattering of $\sim$MeV neutrinos. Such experiments
expect to measure O(keV) ionizatio ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · May 21, 2019
The scintillation light output response of stilbene crystals has been measured for protons recoiling along the a, b, and c’ crystalline axes with energies between 1.3 and 10 MeV using neutrons produced with the tandem Van de Graaff accelerator at Triangle ...
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Journal ArticleNature · May 2019
Double-β-decay involves the simultaneous conversion of two neutrons into two protons, and the emission of two electrons and two neutrinos; the neutrinoless process, although not yet observed, is thought to involve the emission of the two electrons but no n ...
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Journal ArticleIEEE Transactions on Nuclear Science · November 1, 2018
Future ton-scale liquefied noble gas detectors depend on efficient light detection in the vacuum ultraviolet (VUV) range. In the past years, silicon photomultipliers (SiPMs) have emerged as a valid alternative to standard photomultiplier tubes or large-are ...
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Conference2018 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2018 - Proceedings · November 1, 2018
Radiation detection often requires several detectors to be employed at once. Normally, each detector outputs a signal that must be transported, digitized, and stored. One common format for these signals is a finite, aperiodic pulse. Since the detector and ...
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Journal ArticlePhysical Review C · October 5, 2018
We study the response of EJ-301 liquid scintillator to monochromatic 244.6±8.4 keV neutrons, targeting the 10-100 keV proton recoil energy interval. Limited experimental information exists for proton light yield in this range, for this or any other organic ...
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Journal ArticleJournal of Instrumentation · September 17, 2018
We report on the performance of silicon photomultiplier (SiPM) light sensors operating in electric field strength up to 30 kV/cm and at a temperature of 149 K, relative to their performance in the absence of an external electric field. The SiPM devices use ...
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Journal ArticleJournal of Instrumentation · August 29, 2018
We apply deep neural networks (DNN) to data from the EXO-200 experiment. In the studied cases, the DNN is able to reconstruct the relevant parameters - total energy and position - directly from raw digitized waveforms, with minimal exceptions. For the firs ...
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Journal ArticlePhysical Review C · June 15, 2018
The next-generation Enriched Xenon Observatory (nEXO) is a proposed experiment to search for neutrinoless double-β (0νββ) decay in Xe136 with a target half-life sensitivity of approximately 1028 yr using 5×103 kg of isotopically enriched liquid-xenon in a ...
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Journal Article · May 28, 2018
The projected performance and detector configuration of nEXO are described in
this pre-Conceptual Design Report (pCDR). nEXO is a tonne-scale neutrinoless
double beta ($0\nu\beta\beta$) decay search in $^{136}$Xe, based on the
ultra-low background liquid x ...
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Journal ArticlePhysical Review D · April 1, 2018
A search for instability of nucleons bound in Xe136 nuclei is reported with 223 kg·yr exposure of Xe136 in the EXO-200 experiment. Lifetime limits of 3.3×1023 and 1.9×1023 yr are established for nucleon decay to Sb133 and Te133, respectively. These are the ...
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Journal ArticlePhysical review letters · March 2018
The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. The Majorana Demonstrator comprises 44.1 kg of Ge detectors (29.7 kg enriched in ^{76}Ge) split between two modules contained ...
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Journal ArticlePhysical review letters · February 2018
Results from a search for neutrinoless double-beta decay (0νββ) of ^{136}Xe are presented using the first year of data taken with the upgraded EXO-200 detector. Relative to previous searches by EXO-200, the energy resolution of the detector has been improv ...
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Journal ArticleJournal of Instrumentation · January 1, 2018
A new design for the anode of a time projection chamber, consisting of a charge-detecting "tile, is investigated for use in large scale liquid xenon detectors. The tile is produced by depositing 60 orthogonal metal charge-collecting strips, 3 mm wide, on a ...
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Journal ArticlePhysical Review D · November 3, 2017
Searches for double beta decay of Xe134 were performed with EXO-200, a single-phase liquid xenon detector designed to search for neutrinoless double beta decay of Xe136. Using an exposure of 29.6 kg·yr, the lower limits of T1/22νββ>8.7×1020 yr and T1/20νββ ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · November 1, 2017
We report results from a systematic measurement campaign conducted to identify low radioactivity materials for the construction of the EXO-200 double beta decay experiment. Partial results from this campaign have already been reported in a 2008 paper by th ...
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Journal Article · July 14, 2017
This white paper summarizes the workshop "U.S. Cosmic Visions: New Ideas in
Dark Matter" held at University of Maryland on March 23-25, 2017. ...
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Journal ArticlePhysical Review C · February 14, 2017
The EXO-200 Collaboration is searching for neutrinoless double β decay using a liquid xenon (LXe) time projection chamber. This measurement relies on modeling the transport of charge deposits produced by interactions in the LXe to allow discrimination betw ...
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Journal ArticleJournal of Instrumentation · July 19, 2016
The energy resolution of the EXO-200 detector is limited by electronics noise in the measurement of the scintillation response. Here we present a new technique to extract optimal scintillation energy measurements for signals split across multiple channels ...
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Journal ArticleJournal of Cosmology and Astroparticle Physics · April 15, 2016
As neutrinoless double-beta decay experiments become more sensitive and intrinsic radioactivity in detector materials is reduced, previously minor contributions to the background must be understood and eliminated. With this in mind, cosmogenic backgrounds ...
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Journal ArticlePhysical Review D · April 1, 2016
A search for Lorentz- and CPT-violating signals in the double beta decay spectrum of Xe136 has been performed using an exposure of 100 kg·yr with the EXO-200 detector. No significant evidence of the spectral modification due to isotropic Lorentz-violation ...
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Journal ArticlePhysical Review C · March 8, 2016
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless ββ decay of Xe136 to the ground state of Ba136. We report here on a search for the two-neutrino ββ decay of Xe136 to the first 0+ excited state, 01+, of Ba136 based on a 10 ...
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Journal ArticlePhysical Review C - Nuclear Physics · October 28, 2015
Alpha decays in the EXO-200 detector are used to measure the fraction of charged Po218 and Bi214 daughters created from α and β decays, respectively. Rn222 α decays in liquid xenon (LXe) are found to produce Po+218 ions 50.3±3.0% of the time, while the rem ...
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Journal ArticleNuclear and Particle Physics Proceedings · August 1, 2015
The experimental program to search for the coherent elastic neutrino-nucleus scattering at the Spallation Neutron Source is presented. ...
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Journal ArticlePhysical Review C - Nuclear Physics · July 15, 2015
The search for neutrinoless double-beta decay (0νββ) requires extremely low background and a good understanding of their sources and their influence on the rate in the region of parameter space relevant to the 0νββ signal. We report on studies of various β ...
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Journal ArticlePhys. Rev. C · March 20, 2015
The search for neutrinoless double-beta decay (0{\nu}{\beta}{\beta}) requires
extremely low background and a good understanding of their sources and their
influence on the rate in the region of parameter space relevant to the
0{\nu}{\beta}{\beta} signal. W ...
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Journal ArticleInternational Journal of Mass Spectrometry · March 15, 2015
An RF ion-funnel technique has been developed to extract ions from a high-pressure (10 bar) noble-gas environment into a vacuum (10-6 mbar). Detailed simulations have been performed and a prototype has been developed for the purpose of extracting 136Ba ion ...
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Journal ArticlePhysical Review A - Atomic, Molecular, and Optical Physics · February 10, 2015
Progress on a method of barium tagging for the nEXO double beta decay experiment is reported. Absorption and emission spectra for deposits of barium atoms and ions in solid xenon matrices are presented. Excitation spectra for prominent emission lines, temp ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · November 10, 2014
EXO-200 is a single phase liquid xenon detector designed to search for neutrinoless double-beta decay of Xe136. Here, we report on a search for various Majoron-emitting modes based on 100 kg yr exposure of Xe136. A lower limit of T1/2Xe136>1.2×1024yr at 90 ...
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Journal ArticlePhysical review letters · November 2014
A Comment on the Letter by J. H. Davis, Phys. Rev. Lett. 113, 081302 (2014)PRLTAO0031-900710.1103/PhysRevLett.113.081302. ...
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Journal ArticleThe Review of scientific instruments · September 2014
We describe a system to transport and identify barium ions produced in liquid xenon, as part of R&D towards the second phase of a double beta decay experiment, nEXO. The goal is to identify the Ba ion resulting from an extremely rare nuclear decay of the i ...
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Journal ArticleNature · June 2014
Many extensions of the standard model of particle physics suggest that neutrinos should be Majorana-type fermions-that is, that neutrinos are their own anti-particles-but this assumption is difficult to confirm. Observation of neutrinoless double-β decay ( ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 28, 2014
We report on an improved measurement of the 2νββ half-life of 136Xe performed by EXO-200. The use of a large and homogeneous time-projection chamber allows for the precise estimate of the fiducial mass used for the measurement, resulting in a small systema ...
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Journal Article · January 23, 2014
CoGeNT has taken data for over 3 years, with 1136 live days of data
accumulated as of April 23, 2013. We report on the results of a maximum
likelihood analysis to extract any possible dark matter signal present in the
collected data. The maximum likelihood ...
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Journal Article · January 14, 2014
Weakly Interacting Massive Particles (WIMPs) are well-established dark matter
candidates. WIMP interactions with sensitive detectors are expected to display
a characteristic annual modulation in rate. We release a dataset spanning 3.4
years of operation fr ...
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Journal Article · October 16, 2013
This document represents the response of the Intensity Frontier Neutrino
Working Group to the Snowmass charge. We summarize the current status of
neutrino physics and identify many exciting future opportunities for studying
the properties of neutrinos and ...
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Journal ArticlePhysical Review D - Particles, Fields, Gravitation and Cosmology · July 8, 2013
CoGeNT employs p-type point-contact (PPC) germanium detectors to search for weakly interacting massive particles (WIMPs). By virtue of its low-energy threshold and ability to reject surface backgrounds, this type of device allows an emphasis on low-mass da ...
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Journal ArticleProceedings, 2013 Community Summer Study on the Future of U.S. Particle Physics: Snowmass on the Mississippi (CSS2013): Minneapolis, MN, USA, July 29-August 6, 2013 · 2013Cite
Journal ArticlePhysical review letters · July 2012
We report on a search for neutrinoless double-beta decay of 136Xe with EXO-200. No signal is observed for an exposure of 32.5 kg yr, with a background of ∼1.5×10(-3) kg(-1) yr(-1) keV(-1) in the ±1σ region of interest. This sets a lower limit on the half ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · May 21, 2012
We describe purity measurements of the natural and enriched xenon stockpiles used by the EXO-200 double beta decay experiment based on a mass spectrometry technique. The sensitivity of the spectrometer is enhanced by several orders of magnitude by the pres ...
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Journal ArticleJournal of Instrumentation · May 1, 2012
EXO-200 is an experiment designed to search for double beta decay of 136Xe with a single-phase, liquid xenon detector. It uses an active mass of 110 kg of xenon enriched to 80.6% in the isotope 136 in an ultra-low background time projection chamber capable ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · December 11, 2011
We discuss the design, operation, and calibration of two versions of a xenon gas purity monitor (GPM) developed for the EXO double beta decay program. The devices are sensitive to concentrations of oxygen well below 1 ppb at an ambient gas pressure of one ...
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Journal ArticlePhysical review letters · November 2011
We report the observation of two-neutrino double-beta decay in (136)Xe with T(1/2) = 2.11 ± 0.04(stat) ± 0.21(syst) × 10(21) yr. This second-order process, predicted by the standard model, has been observed for several nuclei but not for (136)Xe. The obser ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · October 1, 2011
The Majorana Collaboration is building the Majorana Demonstrator, a 60 kg array of high purity germanium detectors housed in an ultra-low background shield at the Sanford Underground Laboratory in Lead, SD. The Majorana Demonstrator will search for neutrin ...
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Journal ArticleThe Review of scientific instruments · October 2011
A magnetically driven piston pump for xenon gas recirculation is presented. The pump is designed to satisfy extreme purity and containment requirements, as is appropriate for the recirculation of isotopically enriched xenon through the purification system ...
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Journal ArticlePhysical review letters · September 2011
Fifteen months of cumulative CoGeNT data are examined for indications of an annual modulation, a predicted signature of weakly interacting massive particle (WIMP) interactions. Presently available data support the presence of a modulated component of unkno ...
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ConferenceNuclear Physics B - Proceedings Supplements · August 1, 2011
The Majorana Collaboration is assembling an array of HPGe detectors to search for neutrinoless double-beta decay in 76Ge. Initially, Majorana aims to construct a prototype module to demonstrate the potential of a future 1-tonne experiment. The design and p ...
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Journal ArticlePhysical review letters · April 2011
We report on several features in the energy spectrum from an ultralow-noise germanium detector operated deep underground. By implementing a new technique able to reject surface events, a number of cosmogenic peaks can be observed for the first time. We dis ...
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Journal ArticleJournal of Physics: Conference Series · January 1, 2011
Tagging events with the coincident detection of a barium ion would greatly reduce the background for a neutrino-less double beta decay search in xenon. This paper describes progress towards realizing this goal. It outlines a source that can produce large q ...
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Journal ArticleThe Review of scientific instruments · November 2010
We describe a source capable of producing single barium ions through nuclear recoils in radioactive decay. The source is fabricated by electroplating (148)Gd onto a silicon α-particle detector and vapor depositing a layer of BaF(2) over it. (144)Sm recoils ...
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ConferenceAIP Conference Proceedings · December 1, 2009
The MAJORANA collaboration is pursuing the development of the so-called MAJORANA DEMONSTRATOR. The DEMONSTRATOR is intended to perform research and development towards a tonne-scale germanium-based experiment to search for the neutrinoless double-beta deca ...
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ConferenceJournal of Physics: Conference Series · January 1, 2009
Building a 0νβ β experiment with the ability to probe neutrino mass in the inverted hierarchy region requires the combination of a large detector mass sensitive to 0νβ β, on the order of 1-tonne, and unprecedented background levels, on the order of or less ...
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Journal ArticlePhysical review letters · December 2008
A claim for evidence of dark matter interactions in the DAMA experiment has been recently reinforced. We employ a new type of germanium detector to conclusively rule out a standard isothermal galactic halo of weakly interacting massive particles as the exp ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · December 1, 2008
Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The MAJORANA Collaboration proposes to assemble an array of HPGe detect ...
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Journal Article · June 8, 2008
In a previous comment (arXiv:0806.1341v1) we criticized purely technical
aspects of arXiv:0712.1645 but pointed out that many other inconsistencies were
readily apparent. In view of the imminent posting of another version of
arXiv:0712.1645, still containi ...
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Journal ArticleJournal of Cosmology and Astroparticle Physics · September 1, 2007
A new type of radiation detector, a p-type modified electrode germanium diode, is presented. It is shown that the prototype displays, for the first time, a combination of features (mass, energy threshold and background expectation) required for a measureme ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · May 1, 2007
We have designed and built a highly monochromatic 24 keV neutron beam at the Kansas State University Triga Mark-II reactor, as part of an experimental effort to demonstrate sensitivity in a large-mass detector to the ultra-low energy recoils expected from ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · December 11, 2003
We report on the manufacture of a first batch of approximately 2000 Gas Electron Multipliers (GEMs) using 3M's fully automated roll-to-roll flexible circuit production line. This process allows low-cost, reproducible fabrication of a high volume of GEMs of ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · December 1, 2003
Micropatterned gas detectors like GEMs and MICROMEGAS are being considered for time projection chambers (TPC) for linear collider experiments. These devices are made mainly of Kapton insulators and thick copper layers. Because in the micropatterned gas det ...
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Journal ArticleIEEE Transactions on Nuclear Science · October 1, 2003
The detection of low energy neutrinos (< few tens of MeV) via coherent nuclear scattering remains a holy grail of sorts in neutrino physics. This uncontroversial mode of interaction is expected to profit from a sizeable increase in cross section proportion ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · January 1, 2003
Micropatterned gas detectors like Gas Electron Multipliers and MICROMEGAS detectors are expected to play key roles in TPCs (time projection chambers) in future linear collider experiments. Both devices have ideal behavior in the TPC mode such as minimal Ex ...
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